Burglar alarm



Dec. '26, 1922. 1,439,876. 1 C C. ELSEA.

I BURGLAR ALARM.

FILED Fig. 5. 1920. 2 SHEETS-SHEET x.

Clarence dllsea Hon W11 Patented Dec. 26, 1922.

UNITED STATES CLARENCE CORIER ELSEA, OF RIDLEY PARK, PENNSYLVANIA.

BURGLAR ALARM,

Application filed February 5, 1920. Serial No. 356,508.

To all whom it may concern:

Be it known that I, CLARENCE C. ELSEA, citizen of the United States, residing at Ridley Park, in the county of Delaware and State of Pennsylvania, have invented certain new and useful Improvements in Burglar Alarms; and I do hereby declare, the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which itapper tains to make and use the same.

This invention relates to burglar alarms, and while particularly adapted to burglar alarms for automobiles in garages and the like, is not limited thereto.

An object of this invention is to provide an alarm which cannot be tampered with by a burglar and especially in which the burglar cannot reach the circuit wires, which is one of the grave difliculties of the present alarms; as for instance an alarm inserted in a wall or in wood a burglar can very easily with an auger break into the wires and disable the circuit mechanism.

A further object of this invention is to provide an alarm for automobiles in garages whereby an obstructing member is placed in the path of the automobile in being removed from the garage so that the automobile cannot pass by this obstruction without removing the obstruction or tampering therewith in such a manner as to make a circuit that will actuate an alarm at some predetermined position.

A further object of this invention is to provide a burglar alarm that cannot be tampered with by a burglar or disabled by any means which can be easily carried about, as For instance, one which cannot be tampered with by a hack saw or any small tool or instrument that the burglar may carry, and to provide an alarm mechanism which is entirely embedded under the ground and has only projecting portions above the ground which are not workable or cut or broken by any apparatus which a burglar may readily carry.

A further object of this invention is to improve the circuit makers and breakers in relation to alarms of this character.

A further object of this invention is to provide burglar alarm of this character in which the car cannot be jacked up so as to avoid the obstruction of the alarm and to get by the alarm member.

7 A further object of this invention is to provide a simplified and improved form of structure of an embedded mechanism for controlling an automatic burglar alarm so that all of the mechanism relating to the contact makers and breakers can be installed in a small single member and the other parts operative therewith be thereafter attached.

WVith these and other objects in view the invention consists in the construction, the combination, the detail, and arrangement of parts as hereinafter more fully described and claimed.

In the drawings: Figure 1 is a rear view of an automobile in a garage provided with my invention.

lgure 2 is a diagrammatic view of my wiring system.

Figure 3 is an enlarged section partly in -elevation and partly broken away of the lower medial part of Figure 1.

Figure 4 is an enlarged view of fragments of Figure 3 showing the post removed anda cap inserted to cover the post hole.

F gure 5 is a section at 5-5 of Figure Figure 6 is a section at 6-6 of Figure 3.

Figure 7 is a modified form shown at the same position as Figure 5.

Figure 8 is a fragmentary enlarged view of the lower part of Figure 3.

In the embodiment of my invention I provide a post of a cylindrical piece of tool steel indicated by numeral 2, the outer diameter of which conforms to the inner diameter of a socket or tube 3, suflicient clearance being allowed for the insertion of post 2 in tube Tube 3 is provided with a cap 4 locked thereon by screws 5 and carries a pair of lugs 6, upon which lugs b are supported a circuit maker and breaker 7, which circuit maker and breaker comprises a, sliding shaft (1, yieldingly held upward by a spring 6 and having a bearing in an annulus c and provided with an extension 6 having a head 03, there being between said annulus and said head insulationwasher f. Annulus c is fixedly mounted to a bridge 9, which bridge 9 is perforated at it and It to receive a pair of bolts 2' and i, and is also provided with an insulating gasket 7', upon which gasket is mounted an electrode It? the end of said electrode extending normally between the said washer f and the said head 01. So that when the said shaft a is held yieldingly upward by the spring Z) a circuit is made between the electrode It and the head (Z, which is another electrode, which circuit is completed through wires 7H and m the wire m having as its electrode the said electrode is and the wire 717/ having as its electrode the said head d. The said tube 3, together with the cap l thereto aiiixed, is embedded underground preferably in a concrete wall 8 with the top of the said tube slightly below the level of the floor of the garage, so that a cap 9 can be inserted thereon and be flush with the level oi the said floor. The tube 3 is provided with a longitudinal slot 10 and an annular slot 11 at the lower end of said longitudinal slot. There is also provided a suitable stop which may be in the :torm of a set screw 12,projecting into said slot 11, or the said slot may be only a portion of the way around said tube, thus a providing at its end a stop. The post? is provided with a lug 18, which may be the head of a bolt or cap screw'in said post and which lug conforms in dimensions to the said slots 10 and 11 so asto be readily and easily inserted into slot 10 and then-at'the bottomot slot 10 turned into slot 11. The distance between the lug l3 and the bottom of post 2 is so proportioned relative to the distance between the slot 11 and the bottom of the tube 3 that when the said lug 13 is seated in the slot ll, the said sha'it a is pushed sufficiently down so that the head d is out of contact with the electrode and thereby the circuit is'broken. This is the normal positionofthe burglar alarm when ready for use. That is to say, the post is inserted into the tube inthe position shown in Figure 3 directly behind the automobile in the garage as shown in Figure 1 and is of sufiicient lengthito extend upward far enough above the axle so that the car'cannot be jacked up and gotten over this post. To anyone unfamiliar with the machanism herein it would be impossible to get the or" through the door of the garage and by this post, but ii anyone should understand the mechanism and remove this post,the sha it (1, Hits itself by the spring A and makes a circuit which sounds an alarm, the nmchanisni ior soimding which alarm is shown in Fig ure in which a series of posts provided with tubes and interconnected in parallel by wires P and l?" to a switch Q, when closed and ringing a hell by the energy from a battery or other suitable generator 8. Cap 4- is perforated at 20 to receive a COIlClilltQil, whichconduit 21 carries the said circuit wires underground to within a desired distance of the predetermined position of the bell 1", which may be in the sleeping room of a house'adj-acent the garage.

It is therefore apparent that if the said post 2 is unremo'ved, a theft of the automobile is practically impossible, and that if the said bar 2 is removed, that an alarm will be sounded in the room of the owner or some other desired place, and it is further apparent that it is practically impossible to tamper with the wiring connections betwee the circuit makers and breakers and the said alarm, the whole electrical connection being underground.

This post 2 is made of such size and metal as to make it practically impossible to cut the same with any tools which a burglar might carry, such as a hack saw or file. It is further obvious that there is only a single member to install underground after the said cap has been attached to the said tube and the said conduit 20 has been attached to the said cap, and that the whole circuit making and breaking mechanism'is carried in the said cap.

What I claim is:

l. A. device for preventing the theft oi. automobiles comprising a tube provided with a cap, a circuit maker and breaker within said cap, a post operable of said circuit maker and breaker, slidable in said tube, means for locking said post in said tube in operative engagement with the circuit maker and breaker part cl said. post projecting above the tube as and for tl'ie purposes specified.

2. i i device to prevent the theft of vehicles 'con'iprising in combination a tube adapted to be buried vertically in the ground, a cap reniovably secured to the lower end oi? said tube, a vertically operable circuit breaker mounted in said cap, a bar adapted to seat in said tube and project above'the samewith its lower end in en gagement with the circuit breaker, and looking means for holding said bar in said tube.

In a device for preventing theft of vehicles comprising a tubular member vertically embedded in the ground, an obstruction bar adapted to seat in said tube and project there-above in the path of the vehi ole, a circuit breaker comprising in cons hination a cap member adapted to be secured to the lower end oi the tubular menn l'ier, a bridge in said cap member, a vertical-- ly movable member carried by said bridge having a conductive head, contact members supported by said hridg in the path of said metallic head, and means for normally elevating said slidable member and metallic head to complete acircuit between said contact members. i i

In a device for preventing theft of automobiles, a circuit breaker comprising a container adapted to be buried in the ground, a horizontal bridge member in said container, a vertically slidable member mounted on said bridge having a conductive head, electrical contact members supported by said bridge in the path of said conductive head, spring means for normally elevating said sliding member to bridge said contacts by said conductive head, and means for holding said sliding member depressed comprising a tubular member communicating with said container terminating at the surface of the ground, an obstruction bar adapted to slide in said tubular member and to project above the same in the path of the vehicle, and locking means for holding said obstruction bar in position in said tube in engagement with said slidable member of the circuit breaker so as to hold the same depressed with the metallic head out of con- 10 tact with the contact members.

In testimony whereof I aflix my signature.

CLARENCE (JORIER ELSEA. 

